Heine-Handbuch

Höhn, Gerhard

doi:10.1007/978-3-476-03651-3

Cited by 19 publications

(2 citation statements)

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“…Nanocrystalline Zr02-and Y203-powders with grain sizes ranging from 5 to 20nm were prepared by the IGC method [7] using polycrystalline ZrO and Y as precursors, respectively. The phases and the grain size of the powders were measured by X-ray diffraction (XRD), using the Scherrer formula [8], and by tiitrogen adsorption, using the method developed by S. Brunauer, P. Emmet and E. Teller (BET) [9].…”

Section: Methodsmentioning

confidence: 99%

“…by changing the Y content, which influences mainly the stabilized phase (tetragonal or cubic) [3 -51. The highest conductivities were found in cubic zirconia (Y2O3 [7] for the preparation of nanocrystalline ZrO2and Yz03-powders the grain size arose as a further parameter for the improvement of the mechanical and electrical properties of stabilized zirconia. Nanocrystalline materials contain a large fraction of grain boundaries and are therefore expected to reveal properties, which are different compared to the bulk properties.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the complex conductivity of nanocrystalline Y₂O₃‐stabilized zirconia

Mondal

Hahn

1997

Ber Bunsenges Phys Chem

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Nanocrystalline ZrO2‐ and Y2O3‐powders with grain sizes from 5‐20 nm were prepared by the Inert Gas Condensation method. The powders were mixed in different fractions, pressed into green bodies and sintered to ceramic samples with 35‐49 nm average grain size. The phase, grain size and specific surface area of the powders and ceramic samples was characterized by X‐ray diffraction and nitrogen adsorption. Densities from 82 to 93% of the single crystal density were determined using the Archimedes principle. The complex conductivity was measured for frequencies ranging from 20 Hz to 3 MHz at temperatures between 80 and 1100 K. The lattice relaxation, grain boundary relaxation and the contact process could be resolved and identified. The dc‐conductivity for the lattice and the grain boundaries were deduced from the data. The activation energies for dc‐conductivity were determined for the lattice and the grain boundaries as 0.85 ± 0.05 and 1.0 ± 0.1 eV, respectively.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%